Terahertz saturable absorbers exploiting intersubband polaritons

Novel In-Plane Semiconductor Lasers XX(2021)

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摘要
We devise a THz polaritonic saturable absorber exploiting ultra-strong coupled intersubband cavity polaritons generated in a multi quantum well (MQW) heterostructure. By coupling the polaritonic saturable absorber reflector with a high bandwidth heterogeneous THz QCL frequency comb (2.3-3.8 THz) we demonstrate spectral reshaping of the QCL emission and a major increase of the comb operational dynamic range up to 38% characterized by a stable single and narrow intermode beatnote.
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关键词
Saturable absorption,Quantum cascade laser,Frequency comb,Polariton,Terahertz radiation,Quantum well,Optoelectronics,Heterojunction,Reflector (antenna),Materials science
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